Although I have never come across the Drilus, who is a stranger to my district, I conjecture a method of attack very similar to that of the Glow-worm.

Like our own Snail-eater, the Algerian insect does not cut its victim into small pieces: it renders it inert, chloroforms it by means of a few tweaks which are easily distributed, if the lid but half-opens for a second.

That will do.

The besieger thereupon enters and, in perfect quiet, consumes a prey incapable of the least muscular effort.

That is how I see things by the unaided light of logic.
Let us now return to the Glow-worm.